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The scales of combined effects by using the log(CI) grading.
| Range of Combination Index | Description | |
|---|---|---|
| Synergism | <0.1 | Very strong synergism |
| 0.1–0.3 | Strong synergism | |
| 0.3–0.7 | Synergism | |
| 0.7–0.85 | Moderate synergism | |
| 0.85–0.90 | Slight synergism | |
| 0.90–1.10 | Nearly additive | |
| Antagonism | 1.10–1.20 | Slight antagonism |
| 1.20–1.45 | Moderate antagonism | |
| 1.45–3.3 | Antagonism | |
| 3.3–10 | Strong antagonism | |
| ˃10 | Very strong antagonism |
